Diversity, dominance and spatial patterns are all interrelated are all affected by the presence of abiotic and biotic factors in an ecosystem.
Some species are resistant to allelochemicals released by others, so there is some degree of specificity. However, I don;t think there is any evidence that a particular species has an inhibitory effect on a single other species.
It is interesting to see this phenomenon in nature. In my experience Casuarina may have some allelopathic effect on the other plants. I did research in Casuarina plantation. I noticed that there were no plants germinated or grown under the floor of the plantation. One effect may be the accumulation of the non-decomposed fallen Casuarina leaves for a thickness of 5-10 inches. I do not exactly know this is due to the allelopathic effect/s. I planned to have a study on that. Please share your experiences in this issue.
For information on the possible allelopathic effects of Casuarina equisitifolia, see: Suresh KK, Vinaya Rai RS. 1987. Studies on the allelopathic effects of some agroforestry tree crops. International Tree Crops Journal: 109-115.
Still, it doesn't address the question if specific species can be targeted. I don't know of any references demonstrating this.
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